I'm trying to create a simply ruby script to run an ffmpeg command through bash to convert an audio file from one format to another.
the command is ffmpeg -i (in file) -acodec libmp3lame -ab 64k -ar 48000 -ac 1 AAA_S00E00_Podcast.mp3
I have a ruby script with the right permissions and that I can call (tested it with a system ls call before moving onto the ffmpeg attempt)
#!/bin/ruby
def mkmp3( one = "", two = "" )
system "ffmpeg -i #{one} -acodec libmp3lame -ab 64k -ar 48000 -ac 1 #{two}.mp3"
end
mkmp3
but when I call it from bash trying to convert a file called session.flac to smoochie.mp3 I get back:
mkmp3.rb ('session.flac', 'smoochie')
bash: syntax error near unexpected token `'session.flac','
The error is because you are using parenthesis ( and ) to add arguments to your ruby script. Remove them and the error will be gone; in fact, you only need to specify your strings separated by a space (otherwise you will get the comma , as a string):
$ mkmp3.rb session.flac smoochie
Now, to use those parameters you need to add ARGV in your script, like this:
#!/bin/ruby
def mkmp3( one = ARGV[0], two = ARGV[1] )
system "ffmpeg -i #{one} -acodec libmp3lame -ab 64k -ar 48000 -ac 1 #{two}.mp3"
end
mkmp3
ARGV will contain an array of strings with the arguments you added, consider this script (test.rb):
#!/bin/ruby
puts ARGV.inspect
Execute the script:
$ ruby so.rb one two
And the output will be:
["one", "two"]
So you access each value using the array index (i.e. ARGV[0] and ARGV[1]).
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